fresh air injection ?

littlewarby · Post by **littlewarby** » Sat Oct 02, 2010 10:01 pm

have 1987 3.5 in landrover which has 3 pipes on each bank coming from the head to a y pipe & connecting into air intake pipe from filter
apart from getting in the way when replacing the plugs what are they used for & do i need to keep them for the mot.
has been said by some landrover lads to take off & plug up holes??

poo slinger · Post by **poo slinger** » Sat Oct 02, 2010 11:55 pm

are they for military use? i think it was for the military mechanics that worked on the veihcles, somthing to do with making it safer, emissions wise.

Quagmire · Post by **Quagmire** » Mon Oct 04, 2010 10:00 am

Think you are talkign about the "pulsair" system- from what I have heard it basically dilutes exhaust gas with fresh air to give cleaner emissions out the exhaust?

Most people plug them with no problems.

V8Smudge · Post by **V8Smudge** » Mon Oct 04, 2010 4:59 pm

unstable load · Post by **unstable load** » Tue Oct 05, 2010 7:03 pm

Can someone please try to explain to me how that is not a bodge.
The same amount of exhaust gas goes out the engine, just diluted significantly, so what is the big deal? Is it just smoke and mirrors?

Post by **katanaman** » Wed Oct 06, 2010 2:16 am

a bodge maybe but this is happening at the hottest part of the exhaust so it isnt just diluting the exhaust, there will be chemical reactions happening as well. Think poor mans catalytic converter.

kiwicar · Post by **kiwicar** » Wed Oct 06, 2010 5:37 am

the most important one is 2xCO +O2 -> 2CO2
Best regards
Mike

Will Reeve · Post by **Will Reeve** » Wed Oct 06, 2010 7:09 am

Has it got cats? My new cars inject air via a pump into the exhaust on cold starts to strike up the cats to temp quickly!

davehoos · Post by **davehoos** » Wed Oct 06, 2010 10:32 am

pulsair is to reduce unburnt fuel/oil.--during warm up and deceleration and if it has a thermal reactor pump--oz sd1 --it will work on cruise.

oz models dont have a cat.Pollution "bag test"is measured of a set trip.to meet the trip quantity air pumps and tall axle ratio are used.

the air jet in the port is aimed at the valve.when the ex valve closes the drop in pressur allows a PULSE of clean air to burn any fuel left in the header.

Cataliser engines use oxygen to mix with unburnt HC to oxidise and generate heat in the catalist.a fast burn-lean burn engines mitubishi/rover dont require a catalist except to meet NOX .

NOX [created under load] is reduce by increased unburnt HC.so most systems are designed not to work when high back pressure occures.
modern diesel; are now adding fuel to exhaust like subaru and evo have done to get the tubo working.